private void load_data_2_grid()
 {
     US_DM_MON_HOC v_us = new US_DM_MON_HOC();//Khai báo US
     //DataSet v_ds = new DataSet();
     m_ds.Clear();
     DataTable v_dt = new DataTable();
     m_ds.Tables.Add(v_dt);
     v_us.FillDatasetTheoMonHoc(m_ds, CIPConvert.ToDecimal(m_cbo_mon_hoc.SelectedValue));
     m_grc.DataSource = m_ds.Tables[0];
 }